Hearing of Troy's fall she took no action (4)

I believe the answer is:

dido

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'hearing of troy's fall' is the definition.
The definition suggests a singular noun which matches the answer.

'she took no action' is the wordplay.
'she' becomes 'Di'.
'took' is a charade indicator (letters next to each other).
'no action' becomes 'do' (I can't explain this - if you can you should give a lot more credence to this answer).
'di'+'do'='DIDO'

Can you help me to learn more?

(Other definitions for dido that I've seen before include "In Roman mythology, she committed suicide when abandoned by Aeneas" , "Antic" , "Former queen of Carthage" , "---- and Aeneas, opera by Purcell" , "Character in Purcell opera" .)

I've seen this clue in The Globe and Mail.

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